Method clearConst

lib/checkunusedvar.cpp:146–154

        mVarUsage.clear();
    }
    void clearConst() {
        std::set<int> keys;
        for (const std::pair<const nonneg int, Variables::VariableUsage>& var : mVarUsage) {
            if (var.second._var && var.second._var->isConst())
                keys.emplace(var.first);
        }
        for (const int key : keys)
            mVarUsage.erase(key);
    }
    const std::map<nonneg int, VariableUsage> &varUsage() const {
        return mVarUsage;
    }